In this July 6, 2016, file photo, South Korean and U.S. Marines aim their machine guns during a joint military exercise between the two countries in Pohang, South Korea. North Korea on Tuesday, July 16, 2019, says it is rethinking whether to abide by its moratorium on nuclear and missile tests and other steps aimed at improving ties with the U.S. (Kim Joon-bum/Yonhap via AP, File)
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